塾生【じゅくせい】
cram school student, student of a private-tutoring school
私塾【しじゅく】
small private school (esp. for cramming), private school (in the Edo period, orig. run by Confucianists)
塾長【じゅくちょう】
principal of a private school
義塾【ぎじゅく】
private school
入塾【にゅうじゅく】
enrolling at a cram school